The power grid in South Australia now includes a huge Tesla battery tied to a wind farm, allowing the system to supply electricity around the clock. The battery was installed well before Tesla CEO Elon Musk's 100-day guarantee lapsed — and in time for the start of summer.<p>"This is history in the …

(Reuters) - PJM Interconnection, the biggest U.S. electric grid, on Wednesday proposed changes to how it calculates power costs, which could boost wholesale prices 2 percent to 5 percent in 13 Mid Atlantic and Midwest states, or between $440 million and $1.4 billion annually.<p>U.S. Energy Secretary …

The 48-square-mile island is getting 200 utility-scale Tesla Powerpacks<p>When it comes to building power grids, Tesla loves the island life. Over the last year, the company has been installing large-scale energy systems in Australia, Hawaii, and Puerto Rico—and next on the list is the island of …